Is the speed of Earth revolving around the sun changing?

30 kilometers per second

Explanation:

the surface of the earth at the equator moves at a speed of 460 meters per second--or roughly 1,000 miles per hour.  It covers this route at a speed of nearly 30 kilometers per second, or 67,000 miles per hour.

First of all, I cannot give you a precise answer, because the speed of the Earth changes all the time as the Earth moves around the Sun. This is because Kepler's second law says that on its orbit, a planet will sweep equal areas in equal amounts of time.

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be